Henry made haste to reward his own servants, new men who owed all to him and served him faithfully. From them he chose the sheriffs, castellans and councillors through whom he administered the realm during the rest of his long reign. This minor official nobility was the strength of the crown, and was sharply divided in spirit and ambition from the older feudal aristocracy which descended from the original adventurers who had followed William the Conqueror. Yet the latter still remained strong enough to constitute a danger to the crown whenever it should fall to a king less wary and resolute than Henry himself. Henry was by nature more of an administrator and organizer than of a fighting man. He was a competent soldier, but his wish was rather to be a strong king at home than a great conqueror abroad. Nevertheless he was driven by the logic of events to attack Normandy, for as long as his brother reigned there, and as long as many English barons retained great holdings on both sides of the Channel and were subjects of the duke as well as of the king, intrigues and plots never ceased. The Norman war ended in the battle of Tenchebrai (Sept. 28, 1106), where Duke Robert was taken prisoner. His brother shut him up in honourable confinement for the rest of his life, though otherwise he was not ill-treated. For the rest of his reign Henry was ruler of all the old dominions of the Conqueror, and none of his subjects could cloak disloyalty by the pretence of owing a divided allegiance to two masters. With this he was content, and made no great effort to extend his dominions farther; his desire was to reign as a true king in England and Normandy, rather than to build up a loosely compacted empire around them. Henry's difficulties with the church.